Vocabulary What does 8日 (ようか, youka) mean? 8日 (ようか, youka) means 8th day of the month. Quick factsReadingようかRomajiyoukaPart of speechnoun 8日ようかyouka8th day of the month1noun 8th day of the month2noun eight daysAlso written: 八日Kanji in this word日day; sun